US20220105474A1 - Air burst system for cleaning submerged screen intake - Google Patents
Air burst system for cleaning submerged screen intake Download PDFInfo
- Publication number
- US20220105474A1 US20220105474A1 US17/544,582 US202117544582A US2022105474A1 US 20220105474 A1 US20220105474 A1 US 20220105474A1 US 202117544582 A US202117544582 A US 202117544582A US 2022105474 A1 US2022105474 A1 US 2022105474A1
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- Prior art keywords
- air
- burst
- pressure
- purging
- supply piping
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- 238000004140 cleaning Methods 0.000 title claims description 8
- 238000010926 purge Methods 0.000 claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
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- 238000001914 filtration Methods 0.000 description 3
- 238000010348 incorporation Methods 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 2
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- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
- E02B1/003—Mechanically induced gas or liquid streams in seas, lakes or water-courses for forming weirs or breakwaters; making or keeping water surfaces free from ice, aerating or circulating water, e.g. screens of air-bubbles against sludge formation or salt water entry, pump-assisted water circulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/33—Self-supporting filtering elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
- B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/661—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps by using gas-bumps
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/04—Methods or installations for obtaining or collecting drinking water or tap water from surface water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2315/00—Details relating to the membrane module operation
- B01D2315/06—Submerged-type; Immersion type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/18—Use of gases
- B01D2321/185—Aeration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
- E03B3/16—Component parts of wells
- E03B3/18—Well filters
Definitions
- the present invention is directed to submerged intake filters for filtering surface water. More specifically, the present invention is directed to an air burst system for cleaning submerged intake filters.
- Water collection systems are typically used to provide water to end users such as manufacturing plants, cities, irrigation systems, and power generation facilities located adjacent a body of water such as a river, lake, or salt water bodies.
- the end users can employ this type of system as an alternative to drilling water well or buying water from a municipality.
- Many of these systems are also made necessary based on the location of the end user, for example remote locations where water from a municipal source and/or electrical power to operate pumps is not readily available.
- These water collection systems have the ability to adapt to varying conditions and deliver water efficiently and economically.
- these water collection systems use an inlet pipe adapted to transport water from a position submerged in the body of water to the end user at a location adjacent the body of water.
- An inlet pipe is submerged in the body of water and the end of the inlet pipe is typically coupled to an intake screen.
- the intake screen functions as a rough filter, for example, using such as ribs, wire mesh, or perforated screens disposed on an outer surface to prevent the introduction of large waterborne debris and/or aquatic life of a certain size, from entering the inlet pipe.
- the intake screen can become plugged and/or blinded so as to negatively impact intake performance.
- the intake screen can become entrained with debris such as, for example, sticks or logs ore even trash.
- debris such as, for example, sticks or logs ore even trash.
- temperatures can be low enough to form frazil ice, which can similarly coat or plug the intake screen. If the intake screen is not cleared of this debris, water flow through the intake screen can eventually be halted.
- An alternative design known as a HydroburstTM system available from the Johnson Screens® division of the Aqseptence Corporation uses one or more pulses of pressurized air delivered to the interior of the intake screen to expel debris from the exterior of the intake screen. While these air burst systems are very effective, their performance can be hindered as filtering locations move further off shore and away from a supply of pressurized air. In order to have the greatest cleaning success, the submerged supply piping that provides the pressurized air to the interior of the intake screen must be cleared of water prior to pulsing the pressurized air. As the location of the intake screen moves further offshore, the total volume of water that must be cleared from the submerged supply piping continues to increase, which can limit the volume of pressurized air available for the pulses as well as increasing air pressure recharging times between pulses.
- Representative embodiments of the present invention are directed to systems and methods for purging air burst supply piping of accumulated water prior to delivering pulses of pressurized air to an interior of a screen intake through the air burst supply piping.
- the present invention is directed to the removal of accumulated water in the air burst supply piping prior to delivering one or more pulses of pressurized air to the screen intake through the air burst supply piping.
- the systems and methods of the present invention can include a purge compressor delivering a purging air supply at a head pressure slightly above a head pressure of water in the air burst supply piping, wherein the head pressure of the water is equivalent to a depth at which the intake screen.
- the systems and methods can include a purge line arranged in a parallel orientation to an air burst supply line, wherein both the purge line and the air burst supply line are operably coupled to a pressurized air tank.
- offshore refers not only to its conventional usage of situated or occurring on land but will also refer to other locations in which screen intakes and their accompanying systems and methods are utilized. These can include both temporary and permanent installations making use of floating barges, either docked, anchored or otherwise free-floating, as well as offshore structures such as oil and natural gas rigs.
- FIG. 1A is a schematic illustration of a conventional air burst system according to the prior art.
- FIG. 1B is a side view of an onshore air system according to the prior art.
- FIG. 1C is a front view of a submerged screen intake according to the prior art.
- FIG. 2A is a schematic illustration of an air burst system according to the present invention.
- FIG. 2B is a schematic illustration of an alternative embodiment of the air burst system of FIG. 2A according to the present invention.
- FIG. 3A is a schematic illustration of an alternative embodiment of an air burst system according to the present invention.
- FIG. 3B is a schematic illustration of an alternative embodiment of the air burst system of FIG. 3A according to the present invention.
- a conventional air burst system 100 generally includes an onshore air system 102 , a distributor system 104 and a submerged screen intake 106 .
- onshore air system 102 will include a receiver tank 108 for storing compressed air and a burst compressor 110 that charges/fills the receiver tank 108 with the compressed air.
- the burst compressor 110 and receiver tank 108 are selected such that the compressed air within the receiver tank 108 is pressurized to within the range of 165-200 PSIA.
- Onshore air system 102 can also include a control panel 111 that allows an onshore operator to set a burst frequency for the onshore air system 102 .
- the control panel 111 can include necessary components for setting the burst frequency including, for example, a digital or mechanical timer, a microprocessor based controller, a programmable logic controller or similar control element and can include an input device such as for example, a keyboard, mouse, display, touch screen display and the like.
- Distributor system 104 generally comprises a length of air supply piping 112 having an onshore end 114 that is operably connected to the receiver tank 108 and an offshore end 116 that operably connected to an airburst manifold 118 that is located within the submerged screen intake 106 .
- an operator will specify a burst frequency of the onshore air system 102 using the control panel 111 .
- the burst frequency can vary based on factor including, for example, the water quality in which the submerged screen intake 106 resides, the amount of solid contaminants, particles and objects within the water and time of year, for example summer versus winter when frazil ice may be present.
- the control panel 111 opens a supply valve 120 that releases pressurized air from the receiver tank 108 into the air supply piping 112 . Due to the submerged location of the air supply piping 112 , the pressurized air must push any accumulated water out of the air supply piping 112 prior to releasing a pressurized burst through the airburst manifold 118 .
- the receiver tank 108 must be sized not only to provide the necessary pressurized burst but also to force any accumulated water from the air supply piping 112 . This increases the required size and volume of the receiver tank 108 , which will consequently increase costs for the air burst system 100 and possible make the air burst system 100 impractical for use in remote locations.
- air burst system 200 can comprise an onshore air system 202 , a distributor system 204 and a submerged screen intake 206 .
- Onshore air system 202 generally comprises a receiver tank 208 , a primary compressor 210 , a secondary compressor 212 and a control panel 214 .
- Primary compressor 210 generally compresses air and fills receiver tank 208 for use in providing a pressurized burst of air to the distributor system 204 through a burst line 216 .
- Secondary compressor 212 can be connected directly to the distributor system 204 through a purge line 218 .
- the primary compressor 210 and receiver tank 208 are selected such that the compressed air within the receiver tank 208 is pressurized to within the range of 165-200 PSIA.
- the secondary compressor 212 is generally sized for the removal of accumulated water from the distributor system 204 and will be dependent upon the depth at which the distributor system 204 and submerged screen intake 206 are submerged.
- the second compressor 212 can be sized so as to provide compressed air at greater than 30-40 feet of head pressure.
- Onshore air system 202 can also include a controller 220 in the control panel 214 that allows an onshore operator to set a burst frequency for the onshore air system 202 .
- the controller 220 can include necessary components for setting the burst frequency including, for example, a digital or mechanical timer, a microprocessor based controller, a programmable logic controller or similar control element and can include an input device such as for example, a keyboard, mouse, display, touch screen display and the like. Controller 220 will selectively open and close a purge valve 222 and a burst valve 224 , located within the purge line 218 and burst line 216 respectively, so as to selectively provide purge air or burst air to the distributor system 204 .
- a purge valve 222 and a burst valve 224 located within the purge line 218 and burst line 216 respectively, so as to selectively provide purge air or burst air to the distributor system 204 .
- Distributor system 204 generally comprises a length of air supply piping 226 .
- the air supply piping 226 generally includes an onshore end 228 that is fluidly coupled to both the burst line 216 and the purge line 218 .
- the air supply piping 226 further comprises an offshore end 230 that is operably coupled to an airburst manifold 232 that is located within the submerged screen intake 206 .
- the air supply piping 226 can further comprise a supply bend 234 located between the onshore end 228 and the offshore end 230 to help ensure that the air supply piping 226 is cleared of water prior to supplying burst air to the airburst manifold 232 .
- Air supply piping 226 can further comprise a pressure senor 235 proximate the offshore end 230 , wherein the pressure sensor 235 can supply pressure data to the control panel 220 indicating when a pressure reading in the air supply piping 226 is equal to the pressure of the purging air supplied by the second compressor 212 such that confirmation is provided that any water in the air supply piping 226 has been removed and the air burst can be provided from the receiver tank 208 .
- air supply piping 226 can further comprise a screen valve 236 located in proximity to the offshore end 230 , wherein the screen valve 236 can be selectively opened and closed at the direction of the control panel 220 .
- Screen valve 236 can allow air supply piping 226 to be fully pressurized throughout its length, for example, between the onshore air system 202 and the offshore end 230 . As illustrated, screen valve 236 can be external to the submerged screen intake 206 or alternatively, screen valve 236 can be in proximity to the airburst manifold 232 that is located within the submerged screen intake 206 .
- an operator will specify a burst frequency of the onshore air system 202 using the control panel 220 .
- the burst frequency will vary based on the factors previously discussed with respect to air burst system 110 and can include, for example, water quality including the presence of solid contaminants, particles and objects within the water and time of year, for example summer versus winter when frazil ice may be present.
- the air burst system 200 of the present invention undergoes a purge cycle prior to providing pressurized air from the receiver tank 208 .
- the control panel 220 causes the purge valve 222 to be opened such that the secondary compressor 212 can supply purge air through the purge line 218 and into the air supply piping 226 .
- the pressure at which the secondary compressor 212 operates is dependent upon the submerged depth of the air supply piping 226 and the submerged screen intake 206 .
- the head pressure of the purge air will typically be greater than 30-40 feet of head and in all cases should exceed the submerged depth of the air supply piping 226 and the submerged screen intake 206 , any accumulated water within the air supply piping 226 and submerged screen intake 206 is expelled through the airburst manifold 232 such little to no water remains within the air supply piping 226 and the submerged screen intake 206 .
- the pressure sensor 234 transmits a signal to the control panel 220 indicating that the pressure within the air supply piping 226 exceeds the depth pressure so as to provide the control panel 220 with confirmation that the purge cycle has been completed.
- primary compressor 210 can be operating independently as directed by the control panel 220 to fill the receiver tank 208 with pressurized air at a desired air burst pressure.
- the air supply piping 226 includes the screen valve 236
- screen valve 236 can be closed following completion of the purge cycle to maintain the pressurized purge air within the air supply piping 226 until an air burst is requested.
- the control panel 220 closes the purge valve 222 and causes the burst valve 224 to open. With the burst valve 224 open, burst air from the receiver tank 208 is supplied into now evacuated distributor system 204 .
- the burst air supplied from receiver tank 208 is provided at a pressure of 165-200 PSIA.
- the volume of burst air necessary to achieve a pressurized burst through the airburst manifold 232 is significantly reduced as compared to the prior art and may constitute less than half of the air volume necessary with the prior art.
- the capacity of both receiver tank 208 and primary compressor 210 can both be significantly reduced in comparison to conventional designs resulting in significant savings and making the air burst system 200 practical in some remote locations that otherwise may be impractical.
- the design capacity of receiver tank 208 can shrink by 50% or more, for example, from about 12,000 gallons to about 6,000 gallons or less leading to significant savings in both construction and transportation.
- the reduced size of the primary compressor 210 as compared to conventional designs can allow for the air burst system 200 to utilize solar power making the air burst system 200 even more advantageous for remote locations.
- the evacuation of water from the distributor system 204 during the purge cycle can allow for the offshore distance of the submerged screen intake 206 to be increased, for example, from a current maximum of about 1,500 feet offshore to an extended distance of 2-3 km offshore.
- the purge cycle allows for the diameter of the air supply piping 226 to be decreased which can lead to significant cost savings, especially when the submerged screen intake 206 is located a significant distance offshore.
- an alternative embodiment of air burst system 200 can include the addition of a secondary tank 209 that is filled by the secondary compressor 212 and which is directly connected to the purge line 218 . Operation is otherwise similar to air burst system 200 but with the exception that the purge air comes from the secondary tank 209 as opposed to directly from the secondary compressor 212 . This can allow the secondary compressor 212 to be reduced in size/capacity as the secondary compressor 212 can fill the secondary tank 209 over an extended time as opposed to being sized to purge all of the air supply piping 226 directly.
- secondary tank 209 is not required to be fabricated to withstand the high pressures of the receiver tank 208 and the corresponding air burst pressures such that the costs of fabricating the secondary tank 209 can be reduced.
- an alternative embodiment of an air burst system 300 can similarly make use of a purge cycle prior to providing pressurized air to the submerged screen intake 206 .
- the performance and advantages of air burst system 300 can be substantially the same as air burst system 200 but using a different configuration.
- secondary compressor 212 is essentially by directly connecting the purge line 218 to a pressure regulating valve 302 that is fluidly connected to the receiver tank 208 .
- the pressure regulating valve 302 bleeds the high pressure air contained within the receiver tank 208 to the desired purge pressure where it is directed into the distributor system 204 .
- pressure regulating valve 302 can further perform the function of purge valve 222 .
- the control panel 220 closes the pressure regulating valve 302 , whereby the burst valve 224 is opened and the burst air is provided from the receiver tank 208 in a manner similar to that as described with respect to air burst system 200 .
- a means for purging a distributor system will generally comprise the components described relative to the purge line 218 .
- the means for purging a distributor system relative to air burst system 200 will generally comprise the secondary compressor 212 , the purge line 218 , the purge valve 222 and the operational control provided by the control panel 220 .
- the means for purging the distributor system can comprise the receiver tank 208 , the purge line 218 , the purge valve 222 , the pressure regulating valve 302 and the operational control provided by the control panel 220 .
- purge line 218 can be completely removed and pressure regulating valve 302 can be positioned within the burst line 216 such that both the purge and air burst functions are accomplished through purge line 218 . In this way, capital and installation costs can be reduced in that there is no necessity for any of the components of purge line 218 .
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Abstract
Description
- The present application is a continuation application of U.S. patent application Ser. No. 16/971,548 (issued as U.S. Pat. No. 11,192,068), filed on Aug. 20, 2020, which was a National Phase entry of PCT Application No. PCT/US19/18728, filed on Feb. 20, 2019, which claims priority to U.S. Provisional Application Ser. No. 62/633,036 filed Feb. 20, 2018 and entitled “AIR BURST SYSTEM FOR CLEANING SUBMERGED SCREEN INTAKE”, all of which are hereby incorporated by reference in their entirety.
- The present invention is directed to submerged intake filters for filtering surface water. More specifically, the present invention is directed to an air burst system for cleaning submerged intake filters.
- Water collection systems are typically used to provide water to end users such as manufacturing plants, cities, irrigation systems, and power generation facilities located adjacent a body of water such as a river, lake, or salt water bodies. The end users can employ this type of system as an alternative to drilling water well or buying water from a municipality. Many of these systems are also made necessary based on the location of the end user, for example remote locations where water from a municipal source and/or electrical power to operate pumps is not readily available. These water collection systems have the ability to adapt to varying conditions and deliver water efficiently and economically.
- Typically, these water collection systems use an inlet pipe adapted to transport water from a position submerged in the body of water to the end user at a location adjacent the body of water. An inlet pipe is submerged in the body of water and the end of the inlet pipe is typically coupled to an intake screen. The intake screen functions as a rough filter, for example, using such as ribs, wire mesh, or perforated screens disposed on an outer surface to prevent the introduction of large waterborne debris and/or aquatic life of a certain size, from entering the inlet pipe.
- During normal operation, the intake screen can become plugged and/or blinded so as to negatively impact intake performance. For example, the intake screen can become entrained with debris such as, for example, sticks or logs ore even trash. When the intake screen is used in cold weather climates, temperatures can be low enough to form frazil ice, which can similarly coat or plug the intake screen. If the intake screen is not cleared of this debris, water flow through the intake screen can eventually be halted.
- A variety of cleaning systems have been utilized to remove debris including physical scraping devices. While these scraping devices can be effective, the inherent problems associated with maintenance and repair of these submerged scraping devices can make them expensive to operate and lead to significant downtime of the inlet pipe.
- An alternative design known as a Hydroburst™ system available from the Johnson Screens® division of the Aqseptence Corporation uses one or more pulses of pressurized air delivered to the interior of the intake screen to expel debris from the exterior of the intake screen. While these air burst systems are very effective, their performance can be hindered as filtering locations move further off shore and away from a supply of pressurized air. In order to have the greatest cleaning success, the submerged supply piping that provides the pressurized air to the interior of the intake screen must be cleared of water prior to pulsing the pressurized air. As the location of the intake screen moves further offshore, the total volume of water that must be cleared from the submerged supply piping continues to increase, which can limit the volume of pressurized air available for the pulses as well as increasing air pressure recharging times between pulses.
- As such, it would be advantageous to improve upon current air burst systems for cleaning screen intakes such that debris removal performance can be maintained as filtering locations move further offshore and way from onshore air supplies.
- Representative embodiments of the present invention are directed to systems and methods for purging air burst supply piping of accumulated water prior to delivering pulses of pressurized air to an interior of a screen intake through the air burst supply piping. Generally, the present invention is directed to the removal of accumulated water in the air burst supply piping prior to delivering one or more pulses of pressurized air to the screen intake through the air burst supply piping. In one representative embodiment, the systems and methods of the present invention can include a purge compressor delivering a purging air supply at a head pressure slightly above a head pressure of water in the air burst supply piping, wherein the head pressure of the water is equivalent to a depth at which the intake screen. In another representative embodiment, the systems and methods can include a purge line arranged in a parallel orientation to an air burst supply line, wherein both the purge line and the air burst supply line are operably coupled to a pressurized air tank.
- As used throughout the present application, the term “onshore” refers not only to its conventional usage of situated or occurring on land but will also refer to other locations in which screen intakes and their accompanying systems and methods are utilized. These can include both temporary and permanent installations making use of floating barges, either docked, anchored or otherwise free-floating, as well as offshore structures such as oil and natural gas rigs.
- The above summary is not intended to describe each illustrated embodiment or every implementation of the subject matter hereof. The figures and the detailed description that follow more particularly exemplify various embodiments.
- Subject matter hereof may be more completely understood in consideration of the following detailed description of various embodiments in connection with the accompanying figures, in which:
-
FIG. 1A is a schematic illustration of a conventional air burst system according to the prior art. -
FIG. 1B is a side view of an onshore air system according to the prior art. -
FIG. 1C is a front view of a submerged screen intake according to the prior art. -
FIG. 2A is a schematic illustration of an air burst system according to the present invention. -
FIG. 2B is a schematic illustration of an alternative embodiment of the air burst system ofFIG. 2A according to the present invention. -
FIG. 3A is a schematic illustration of an alternative embodiment of an air burst system according to the present invention. -
FIG. 3B is a schematic illustration of an alternative embodiment of the air burst system ofFIG. 3A according to the present invention. - While various embodiments are amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the claimed inventions to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the subject matter as defined by the claims.
- As shown in
FIGS. 1A, 1B and 1C , a conventionalair burst system 100 according to the prior art generally includes anonshore air system 102, adistributor system 104 and a submergedscreen intake 106. Typically,onshore air system 102 will include areceiver tank 108 for storing compressed air and aburst compressor 110 that charges/fills thereceiver tank 108 with the compressed air. Generally, theburst compressor 110 andreceiver tank 108 are selected such that the compressed air within thereceiver tank 108 is pressurized to within the range of 165-200 PSIA. Onshoreair system 102 can also include acontrol panel 111 that allows an onshore operator to set a burst frequency for theonshore air system 102. Thecontrol panel 111 can include necessary components for setting the burst frequency including, for example, a digital or mechanical timer, a microprocessor based controller, a programmable logic controller or similar control element and can include an input device such as for example, a keyboard, mouse, display, touch screen display and the like.Distributor system 104 generally comprises a length ofair supply piping 112 having anonshore end 114 that is operably connected to thereceiver tank 108 and anoffshore end 116 that operably connected to anairburst manifold 118 that is located within the submergedscreen intake 106. - Typically, an operator will specify a burst frequency of the
onshore air system 102 using thecontrol panel 111. The burst frequency can vary based on factor including, for example, the water quality in which the submergedscreen intake 106 resides, the amount of solid contaminants, particles and objects within the water and time of year, for example summer versus winter when frazil ice may be present. Generally, thecontrol panel 111 opens a supply valve 120 that releases pressurized air from thereceiver tank 108 into theair supply piping 112. Due to the submerged location of theair supply piping 112, the pressurized air must push any accumulated water out of theair supply piping 112 prior to releasing a pressurized burst through theairburst manifold 118. As such, thereceiver tank 108 must be sized not only to provide the necessary pressurized burst but also to force any accumulated water from theair supply piping 112. This increases the required size and volume of thereceiver tank 108, which will consequently increase costs for theair burst system 100 and possible make theair burst system 100 impractical for use in remote locations. - Referring now to
FIG. 2A , an improvedair burst system 200 according to an embodiment of the present invention is illustrated. Generally,air burst system 200 can comprise anonshore air system 202, adistributor system 204 and a submergedscreen intake 206. -
Onshore air system 202 generally comprises areceiver tank 208, aprimary compressor 210, asecondary compressor 212 and acontrol panel 214.Primary compressor 210 generally compresses air and fillsreceiver tank 208 for use in providing a pressurized burst of air to thedistributor system 204 through aburst line 216.Secondary compressor 212 can be connected directly to thedistributor system 204 through apurge line 218. Generally, theprimary compressor 210 andreceiver tank 208 are selected such that the compressed air within thereceiver tank 208 is pressurized to within the range of 165-200 PSIA. Thesecondary compressor 212 is generally sized for the removal of accumulated water from thedistributor system 204 and will be dependent upon the depth at which thedistributor system 204 and submergedscreen intake 206 are submerged. For example, thesecond compressor 212 can be sized so as to provide compressed air at greater than 30-40 feet of head pressure.Onshore air system 202 can also include acontroller 220 in thecontrol panel 214 that allows an onshore operator to set a burst frequency for theonshore air system 202. Thecontroller 220 can include necessary components for setting the burst frequency including, for example, a digital or mechanical timer, a microprocessor based controller, a programmable logic controller or similar control element and can include an input device such as for example, a keyboard, mouse, display, touch screen display and the like.Controller 220 will selectively open and close apurge valve 222 and aburst valve 224, located within thepurge line 218 and burstline 216 respectively, so as to selectively provide purge air or burst air to thedistributor system 204. -
Distributor system 204 generally comprises a length ofair supply piping 226. Theair supply piping 226 generally includes anonshore end 228 that is fluidly coupled to both theburst line 216 and thepurge line 218. Theair supply piping 226 further comprises anoffshore end 230 that is operably coupled to anairburst manifold 232 that is located within the submergedscreen intake 206. Theair supply piping 226 can further comprise asupply bend 234 located between theonshore end 228 and theoffshore end 230 to help ensure that theair supply piping 226 is cleared of water prior to supplying burst air to theairburst manifold 232. Air supply piping 226 can further comprise apressure senor 235 proximate theoffshore end 230, wherein thepressure sensor 235 can supply pressure data to thecontrol panel 220 indicating when a pressure reading in theair supply piping 226 is equal to the pressure of the purging air supplied by thesecond compressor 212 such that confirmation is provided that any water in theair supply piping 226 has been removed and the air burst can be provided from thereceiver tank 208. In some embodiments,air supply piping 226 can further comprise ascreen valve 236 located in proximity to theoffshore end 230, wherein thescreen valve 236 can be selectively opened and closed at the direction of thecontrol panel 220.Screen valve 236 can allowair supply piping 226 to be fully pressurized throughout its length, for example, between theonshore air system 202 and theoffshore end 230. As illustrated,screen valve 236 can be external to the submergedscreen intake 206 or alternatively,screen valve 236 can be in proximity to theairburst manifold 232 that is located within the submergedscreen intake 206. - In operation, an operator will specify a burst frequency of the
onshore air system 202 using thecontrol panel 220. The burst frequency will vary based on the factors previously discussed with respect toair burst system 110 and can include, for example, water quality including the presence of solid contaminants, particles and objects within the water and time of year, for example summer versus winter when frazil ice may be present. In contrast to the prior art, theair burst system 200 of the present invention undergoes a purge cycle prior to providing pressurized air from thereceiver tank 208. - During the purge cycle, the
control panel 220 causes thepurge valve 222 to be opened such that thesecondary compressor 212 can supply purge air through thepurge line 218 and into theair supply piping 226. As mentioned previously, the pressure at which thesecondary compressor 212 operates is dependent upon the submerged depth of theair supply piping 226 and the submergedscreen intake 206. For example, the head pressure of the purge air will typically be greater than 30-40 feet of head and in all cases should exceed the submerged depth of theair supply piping 226 and the submergedscreen intake 206, any accumulated water within theair supply piping 226 and submergedscreen intake 206 is expelled through theairburst manifold 232 such little to no water remains within theair supply piping 226 and the submergedscreen intake 206. With the water evacuated from theair supply piping 226 and the submergedscreen intake 206, thepressure sensor 234 transmits a signal to thecontrol panel 220 indicating that the pressure within theair supply piping 226 exceeds the depth pressure so as to provide thecontrol panel 220 with confirmation that the purge cycle has been completed. Either prior to or during the purge cycle,primary compressor 210 can be operating independently as directed by thecontrol panel 220 to fill thereceiver tank 208 with pressurized air at a desired air burst pressure. In the event that theair supply piping 226 includes thescreen valve 236,screen valve 236 can be closed following completion of the purge cycle to maintain the pressurized purge air within theair supply piping 226 until an air burst is requested. - Following the completion of the purge cycle, the
control panel 220 closes thepurge valve 222 and causes theburst valve 224 to open. With theburst valve 224 open, burst air from thereceiver tank 208 is supplied into now evacuateddistributor system 204. The burst air supplied fromreceiver tank 208 is provided at a pressure of 165-200 PSIA. As no water is present within theair supply piping 226 and the submergedscreen intake 206, the volume of burst air necessary to achieve a pressurized burst through theairburst manifold 232 is significantly reduced as compared to the prior art and may constitute less than half of the air volume necessary with the prior art. As such, the capacity of bothreceiver tank 208 andprimary compressor 210 can both be significantly reduced in comparison to conventional designs resulting in significant savings and making theair burst system 200 practical in some remote locations that otherwise may be impractical. For example, the design capacity ofreceiver tank 208 can shrink by 50% or more, for example, from about 12,000 gallons to about 6,000 gallons or less leading to significant savings in both construction and transportation. In addition, the reduced size of theprimary compressor 210 as compared to conventional designs can allow for theair burst system 200 to utilize solar power making theair burst system 200 even more advantageous for remote locations. Furthermore, the evacuation of water from thedistributor system 204 during the purge cycle can allow for the offshore distance of the submergedscreen intake 206 to be increased, for example, from a current maximum of about 1,500 feet offshore to an extended distance of 2-3 km offshore. Finally, the purge cycle allows for the diameter of theair supply piping 226 to be decreased which can lead to significant cost savings, especially when the submergedscreen intake 206 is located a significant distance offshore. - Referring now to
FIG. 2B , an alternative embodiment ofair burst system 200 can include the addition of asecondary tank 209 that is filled by thesecondary compressor 212 and which is directly connected to thepurge line 218. Operation is otherwise similar toair burst system 200 but with the exception that the purge air comes from thesecondary tank 209 as opposed to directly from thesecondary compressor 212. This can allow thesecondary compressor 212 to be reduced in size/capacity as thesecondary compressor 212 can fill thesecondary tank 209 over an extended time as opposed to being sized to purge all of theair supply piping 226 directly. In addition,secondary tank 209 is not required to be fabricated to withstand the high pressures of thereceiver tank 208 and the corresponding air burst pressures such that the costs of fabricating thesecondary tank 209 can be reduced. - Referring now to
FIG. 3A , an alternative embodiment of anair burst system 300 can similarly make use of a purge cycle prior to providing pressurized air to the submergedscreen intake 206. The performance and advantages ofair burst system 300 can be substantially the same asair burst system 200 but using a different configuration. Inair burst system 300,secondary compressor 212 is essentially by directly connecting thepurge line 218 to apressure regulating valve 302 that is fluidly connected to thereceiver tank 208. As directed by thecontrol panel 220, thepressure regulating valve 302 bleeds the high pressure air contained within thereceiver tank 208 to the desired purge pressure where it is directed into thedistributor system 204. As such,pressure regulating valve 302 can further perform the function ofpurge valve 222. Following the purge cycle, thecontrol panel 220 closes thepressure regulating valve 302, whereby theburst valve 224 is opened and the burst air is provided from thereceiver tank 208 in a manner similar to that as described with respect toair burst system 200. - With respect to
air burst system 200 andair burst system 300 as previously discussed, a means for purging a distributor system will generally comprise the components described relative to thepurge line 218. For example, the means for purging a distributor system relative toair burst system 200 will generally comprise thesecondary compressor 212, thepurge line 218, thepurge valve 222 and the operational control provided by thecontrol panel 220. Relative toair burst system 300, the means for purging the distributor system can comprise thereceiver tank 208, thepurge line 218, thepurge valve 222, thepressure regulating valve 302 and the operational control provided by thecontrol panel 220. - In another variation of
air burst system 300 as shown inFIG. 3B ,purge line 218 can be completely removed andpressure regulating valve 302 can be positioned within theburst line 216 such that both the purge and air burst functions are accomplished throughpurge line 218. In this way, capital and installation costs can be reduced in that there is no necessity for any of the components ofpurge line 218. - Various embodiments of systems, devices, and methods have been described herein. These embodiments are given only by way of example and are not intended to limit the scope of the claimed inventions. It should be appreciated, moreover, that the various features of the embodiments that have been described may be combined in various ways to produce numerous additional embodiments. Moreover, while various materials, dimensions, shapes, configurations and locations, etc. have been described for use with disclosed embodiments, others besides those disclosed may be utilized without exceeding the scope of the claimed inventions.
- Persons of ordinary skill in the relevant arts will recognize that the subject matter hereof may comprise fewer features than illustrated in any individual embodiment described above. The embodiments described herein are not meant to be an exhaustive presentation of the ways in which the various features of the subject matter hereof may be combined. Accordingly, the embodiments are not mutually exclusive combinations of features; rather, the various embodiments can comprise a combination of different individual features selected from different individual embodiments, as understood by persons of ordinary skill in the art. Moreover, elements described with respect to one embodiment can be implemented in other embodiments even when not described in such embodiments unless otherwise noted.
- Although a dependent claim may refer in the claims to a specific combination with one or more other claims, other embodiments can also include a combination of the dependent claim with the subject matter of each other dependent claim or a combination of one or more features with other dependent or independent claims. Such combinations are proposed herein unless it is stated that a specific combination is not intended.
- Any incorporation by reference of documents above is limited such that no subject matter is incorporated that is contrary to the explicit disclosure herein. Any incorporation by reference of documents above is further limited such that no claims included in the documents are incorporated by reference herein. Any incorporation by reference of documents above is yet further limited such that any definitions provided in the documents are not incorporated by reference herein unless expressly included herein.
- For purposes of interpreting the claims, it is expressly intended that the provisions of 35 U.S.C. § 112(f) are not to be invoked unless the specific terms “means for” or “step for” are recited in a claim.
Claims (20)
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US17/544,582 US20220105474A1 (en) | 2018-02-20 | 2021-12-07 | Air burst system for cleaning submerged screen intake |
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US201862633036P | 2018-02-20 | 2018-02-20 | |
PCT/US2019/018728 WO2019164913A1 (en) | 2018-02-20 | 2019-02-20 | Air burst system for cleaning submerged screen intake |
US202016971548A | 2020-08-20 | 2020-08-20 | |
US17/544,582 US20220105474A1 (en) | 2018-02-20 | 2021-12-07 | Air burst system for cleaning submerged screen intake |
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US16/971,548 Continuation US11192068B2 (en) | 2018-02-20 | 2019-02-20 | Air burst system for cleaning submerged screen intake |
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US11795067B2 (en) * | 2016-06-07 | 2023-10-24 | Ide Water Technologies Ltd. | Environmentally friendly water intake and pretreatment system |
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NO20171753A1 (en) * | 2017-11-06 | 2019-05-07 | Fasseland Mekaniske Verksted As | An Inlet Screen for a Hydropower Plant |
CA3077753A1 (en) * | 2019-04-12 | 2020-10-12 | Cameron Farms Hutterite Colony | Fluid pumping apparatus and methods of use |
CN114130092B (en) * | 2021-12-09 | 2023-04-14 | 江南造船(集团)有限责任公司 | Method and system for cleaning filter screen of submerged pump suction port of liquid cargo tank |
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US5062968A (en) | 1987-09-14 | 1991-11-05 | Warning Theodore A | Apparatus and process for filtering fluids |
US5558462A (en) | 1994-12-02 | 1996-09-24 | The United States Of America As Represented By The Secretary Of The Interior | Flat plate fish screen system |
US6673136B2 (en) * | 2000-09-05 | 2004-01-06 | Donaldson Company, Inc. | Air filtration arrangements having fluted media constructions and methods |
US6758344B2 (en) * | 2002-02-21 | 2004-07-06 | Gordon Construction, Inc. | Self-cleaning fluid filter system |
JP2005193214A (en) * | 2004-01-05 | 2005-07-21 | Yamato:Kk | Filtering apparatus with biofilm/amoeba removing deice |
FR2869552B1 (en) * | 2004-04-29 | 2007-04-06 | Otv Sa | FILTERING DEVICE FOR THE TREATMENT OF WATER, OF THE TYPE OF IMMERSIONED MEMBRANES, INCLUDING ANTI-FLOW MEANS OF THE MEDIUM TO BE FILTERED TO MEANS FOR INJECTING A DECOLMING GAS. |
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CN101091854A (en) * | 2007-04-19 | 2007-12-26 | 无锡意格尔润滑科技有限公司 | Hot filtering method |
CA2686056A1 (en) * | 2007-05-11 | 2008-11-20 | Zenon Technology Partnership | Membrane module with multiple bottom headers and filtration process |
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US8470143B2 (en) * | 2010-01-26 | 2013-06-25 | Daniel Moroni Tucker | Advanced chlorine generating system |
US20130015130A1 (en) * | 2011-07-13 | 2013-01-17 | Joseph Breitner | Pulse aeration for immersed membranes |
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Publication number | Priority date | Publication date | Assignee | Title |
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US11795067B2 (en) * | 2016-06-07 | 2023-10-24 | Ide Water Technologies Ltd. | Environmentally friendly water intake and pretreatment system |
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AU2019224002A1 (en) | 2020-10-15 |
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CN112566709B (en) | 2022-11-04 |
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